Question about 1994 Lincoln Town Car

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Ticking noise from heat duct - 1994 Lincoln Town Car

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This is a classic sign of a blend door motor or the blend door itself having a problem. the changing of the amount of heat or cold air you get out of your vents use to be obtained by turning the knob on the dash which in turn moved the heat door via a cable now all these cars and trucks have gone to using a electric motor which moves the heat door(the blend door due to the fact it blends hot and cold air to obtain the temperature requested by the driver) when these go bad its often caused by the door itself (being its made out of a plastic ) getting deformed and then binding up inside the heater box(this is the housing in which the heater core and the blend door is housed) when it binds up the blend door motor which is a very small motor with plastic gears ,cannot get the door to the position requested by the driver and continues to try and starts skipping the gears in the motor causing the ticking noise your hearing. the parts are not as expensive as the labor ,to repair requires complete removal of the dash on most vehicles to access the blend door.to test you can usually turn the temp knob back to a point were the motor is not binding and most often the noise will stop until you again attempt to move the knob to get more heat or cool air which again it cannot move the door to the place requested so the ticking noise re occurs

Posted on Dec 29, 2010

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